Refractory and heat-insulating cement



Patented July 6, 1926.-

UNITED. STATES 1,591,676 PATENT? OFFICE.

nueo eAnnINowsxv, orIiIcnuo n nnren'rs. IIIssoUnI, AssIeNon 'ro THE GEN-ERAL'INSULATING A D uANUFAc'rUnINe courANY, or ALEXANDRIA, IN'

'nIANA, A conronArIoN or INDIANA.

REFRACTORY ANIJ IHEAT-IN SIlL ATING' can;

No Drawing.

- This invention relates toa cement particularly intended for use insetting heat in sulating bricks or blocks, ofa character derock, I thenadd a composition composed of -mineral wool, asbestos, mineral wool rockcement, and .a gum prepared by dissolving mineral wool in dilutesulphuric acid.

The materials of this composition are added in the following proportionsby weight:

Mineral wool, -'six pounds; asbestos, two pounds; mineral wool rockcement, one pound; mineral wool gum, one pound.

Mineral wool rock is a rock principally found in large quantities innortheast Indiana. There is no special name for the rock, it beingusually referred to as siliceous limestone, but it might be classifiedas felspar, without sodium or potassium percentages. The analysis ofmineral wool rock is approximately as follows:

Per cent.

' Silic 42.84 Alumina and iron oxide 1.40 I Calciumoxide 51.74 Mamesium'oxide 2.75 Undetermined 1.27.

Mineral wool is a fibrous wool-like material resembling spun glass,which may be made by blowing a'powerful jet of air or it is prepared bymelting siliceous limestone, or mineral woo projecting a blast ir orsteam through a stream of melted m,rial. Mineral wool rock (cement, asthis-term is used in the specification, is a cement formed simply bycalcining'at atemperature approximating 1200 F. the mineral wool rock asabove defined.

The substance referred to as mineral wool gum is prepared bydissolvingmineral wool in approximately an eleven per cent solution of sulphuricacid, the mineral wool being added slowly, until all of the acid isneutralsteam through melted slagL- As used by me,

rock, as above defined, and

dilute sulphuric acid, and then combining and mixing the plication filedOctober 23, 1924. Serial No. 745,524.

ized. A gelatinous gummy substance which consists of colloidal silicaand calcium sul-' phate results. This substance is used as a binder inmy improved cement.

The materials of. the composition, as named above, being thoroughlymixed, equal portions of. the composition and of the powdered calcinedrock are thoroughly mixed together. The resulting material is then readyto be bagged and shipped. For use as a mortar, water is added totthecement, tobrin it to the desired consistbricks and allowed to dry, ithardens, and

ency, and when t e cement is placed between in this condition is'bothrefractory-and heat insulating in character. It, therefore, provides anideal cement for use in laying heat insulating bricks, as in liningfurnaces, or

the like.

While the mixture of the powdered calrock a suitable heat insulatingingredient a ne, such as crushed mineral wool 01' suit- .ab y comminutedasbestos.

I claim: p I

1. A refractory and heatinsulatin ce-. ment, comprising a mixture ofpowdered calcined siliceous limestone (mineral wool rock) and a heatinsulating medium.

2. A refractory and heat insulatin 'c'e ment, comprising a mixture ofpow cred calcined siliceous limestone (mineral wool rock) and mineralwool.

- 3. A refractory and heat insulating cement, comprisingpowderedcalcined min eral wool rock mixed with a composition consistingof mineral wool, asbestos, calcined mineral wool rock, and a gumprepared by disslolvingmineral wool in dilute sulphuric aci 4.. Theherein described method of preparing a. refractory and-heat insulatingcement, which consists in powdering calcined mineral wool rock, thenpreparing a com- "position consisting of mineral wool, asbestos,

calcined mineral wool rock and a binding gum prepared by dissolvingmineral wool in powdered calcined rock 5. The herein described method ofpreparing a refractory and heat insulating cement, which consists inpowdering calcined mineral wool rock, then preparing a composition 5consisting of mineral wool, asbestos, calcined mineral wool rock and abinding gum prepared by dissolving mineral woolin dilute sulphuric acid,and then combining and mixing the powdered calcined rock and saidcomposition in equal proportions by Weight. 19

In testimony whereof, I have hereunto set my hand.

HUGO GALLINOWSKY.

